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 A170910 Write exp(-x) = Product_{n>=1} (1 + g_n * x^n); a(n) = numerator(g_n). 8
 -1, 1, 1, 3, 1, 13, 1, 27, 8, 91, 1, 1213, 1, 505, 1919, 2955, 1, 24557, 1, 1136313, 34943, 12277, 1, 65978519, 624, 57331, 58528, 195948483, 1, 1052424027703, 1, 77010795, 7085759, 1179631, 37497599, 7047825380633, 1, 5242861, 89281919, 355723139681937 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Table of n, a(n) for n=1..40. H. Gingold, H. W. Gould, and Michael E. Mays, Power Product Expansions, Utilitas Mathematica 34 (1988), 143-161. G. Helms, A dream of a (number-) sequence EXAMPLE -1, 1/2, 1/3, 3/8, 1/5, 13/72, 1/7, 27/128, 8/81, 91/800, 1/11, ... MAPLE L:=100; t1:=exp(-x); t0:=series(t1, x, L): g:=[]; M:=40; t2:=t0: for n from 1 to M do t3:=coeff(t2, x, n); t2:=series(t2/(1+t3*x^n), x, L); g:=[op(g), t3]; od: g; CROSSREFS Cf. A170911 (denominators). Sequence in context: A263008 A016479 A248843 * A134768 A295827 A277197 Adjacent sequences: A170907 A170908 A170909 * A170911 A170912 A170913 KEYWORD sign,frac AUTHOR N. J. A. Sloane, Jan 30 2010 STATUS approved

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Last modified April 14 10:04 EDT 2024. Contains 371657 sequences. (Running on oeis4.)